<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <fieldset>
        <legend>欢迎登录</legend>
        <div>
            用户名：<input type="text" name="username">
            <br>
            密码：<input type="password" name="password">
        </div>
        <div>
            <input type="submit" value="登录">
        </div>
    </fieldset>
</body>
</html>